Sewing machine for stitching over fastener means



L. ROSEMAN Dec. 27, 1932.

SEWING MACHINE FOR STITCHING OVER FASTENER MEANS Filed Feb; 4, 1931INVENTOR Lea 5056011111,

A TTORNEY Patented Dec. 27, 1932 UNITED STATES PATENT; OFFICE LEOROSEMAN, OF NEWARK,NEW JERSEY Application filed February 4, 1931. SerialNo. 513,255.

This invention relates to improvements in sewing machine attachments toadapt the machine for stitching over fastener means, such e. g. as tapehaving metallic eye loops thereon; and the invention has reference, moreparticularly, to specificjmprovements in fastener stop and positioningmeans of the kind shown in my co-pending application for Letters PatentSerial Number 49%,525, filed November th, 1930. p

In my said co-pending application I have disclosed a stop means whichoperates co1ncidentally with each stitch-forming reciprocation of themachine needle; the specific embodiment of said stop means disclosed insaid application comprising a stop-arm carried by a rock-shaft springpressed in one d rection to bring the stop-arm into active position andcam-actuated to move the stop-arm in-inactive or released position. Inthe present invention I have devised a modified form of stop-armactuating means comprising a rockshaft to carry the stop-arm, a leverfor oscillating said rock-shaft, and a 'cam for positively controllingthe movements of said lever and rock-shaft, whereby the stop-arm ispositively moved and maintained in active position. Owing to thepositive control exercised by the cam the stop-arm cannot acci- 30'dentally yield or jump out .of its active position; and, furthermore,even though it engage on top of a fastener element to be stitched over,it will exercise a clamping effect thereon, thus holding the sameagainst undesired displacement or advance into the path of a descendingmachine needle.

The present invention has for its principal object, therefore, to bothsimplify the means for producing timed movements of the stop- 40 armrelative to the reciprocating sewing nee dle, and to exercise a morepositive control of the stop-arm at all times, both .as to its active aswell as to its inactive or rel ased positions relative to fasteners tobe stitched across during the operation of the sewing machine. V V

This invention .has for a'more specific object to provide .a formof'stop means oscillating cam which will both positively move andmaintain the stop-arm inactive position and also positively move thesame to inactive or released position in desired timed relation to thestitch-forming operations of the machine.

An illustrative embodiment of the present invention is shown in theaccompanying drawing, in which Fig. 1 is a plan view of thestop-mechanism, and Fig. 2 is a vertical transverse section of the same,taken on line 22 in Fig. 1.

Referring to said drawing, the reference character 5 indicates thesewing table or bed plate of any'suitable type of sewing machine,beneath which is arranged the drive shaft 6 of the machine, from whichthe sewing mech anism thereof is driven in the manner familiar to thoseacquaint-ed with the sewing machine art. The sewing mechanism includesthe usual throat-plate, feed-dog, presser foot and thread looper (whichparts are not shown) and with which the reciprocating sewing needle 7cooperates in the well-known manner. The sewing machine may be of thesingle or two needle type, and the needles of either the oscillating orwalking type, or of the non-oscillating or simple verticallyreciprocable type.

The improved and simplified stop mechanism, according to the presentinvention, comprises a bearing bracket '8, which is suitably secured tothe rearward or far side of the bed plate 5 and to the right or inwardside of the sewing mechanism. Said bearin bracket is provided withlongitudinally spaced bearing members 9 and 10 in which is jou-rnaled arock-shaft 11 extending at right angles to the line of movement of thework fed across the sewing mechanism of the 'machine. Extending throughthe outer end portion of said rock-shaft 11, at right angles to the axisthereof, and consequently parallel to the line of movement of the workfed across the sewing mechanism of the machine, {is a stop-arm 12, thesame having a downwardly pitched free end portion 13, which termi vnatesin a downwardly directed stop-finger 14:. Said stop arm 121's adjustablerelative to the rock-shaft 11 to properly dispose its stop finger 14relative to the sewing needle 7; ,a set screw 15 and collar 16 withfasteningscrew 17 being provided to securely hold the stop-arm 12 in thedesired position to which it has been adjusted. In order to adj ustablylocate the stop-arm 12 to dispose its stopfinger 14 in desired laterallyadjacent relation to the sewing needle 7, the bearing member 10 is madein bifurcated form to embrace a collar 18, which is fixed to the rockshaft 11 by a set-screw 19, whereby when the rockshaft is adjusted andthe collar 18 secured, longitudinal displacement of the rock shaft thetrailing wire sides thereof.

Means are provided for producing positively controlled timed oscillationof the rock-shaft 11 to actuate the stop arm 12 synchronously with eachstitch-forming operation of the sewing mechanism, but in such timedrelation to the feeding movement of the latter as to operat-ivelydispose the stopfinger 14 in fastener arresting position prior to thedescent of the needle 7 by which each stitch-forming operatlon is begun,and so as to release or raise said stop-finger from fastener arrestingposition to permit forward feed-' ing movement of the fastener. Themeans for so actuating the rock-shaft 11 and stop-arm 12, comprises alever member 20 fixed on the inner end of said rock-shaft 11, to dependthrough an opening in the machine bed plate 5. Fixed on and rotated bythe drive shaft 6 is a cam member 21 having in one side face thereof acam groove or raceway 22, said groove or raceway having an inwardlyoff-set drop section 23 in its circuit. Mounted on a laterallyprojectingstud 24 fixed to the free end portion of said lever member 20is a roller 25 which projects into and rides in the cam groove orraceway of said cam member 21. Inasmuch as the drive shaft 6 makes onecomplete revolution to each stitch forming operation of the sewing Ymechanism driven thereby, it will be obvious that the stop-finger 14will be positively low-.

cred and raised in proper timed. relation to each stitch-formingoperation, respectively by the traversing of the roller 25 relative tothe high and low points of the rotated box or raceway cam member. Themode of functioning of the stop-finger 14 relative to fastener elementsF fed across the sewing point of the machine is the same as set forth indetail in my afore-mentioned co-pending patent application Serial Number494,525, filed November th, 1930, and therefore need not be repeatedhere.

It should be pointed out, however, that due to the positive controlexercised by the box or raceway cam disclosed in this application overthe lever member and rock-shaft 11, important advantages in theoperation of the stop-arm 12 and its stop-finger 14 are gained. Theseadvantages are that the stop-arm is positively held in its loweredactive position against accidental upward yielding under and pullingmovement of thematerial carrying the fasteners F in either direction,and consequently pressure of a fastener against either the forward orrear side of the stopfinger 14 cannot cause upward displacing movementof said finger, since the cam raceway engages both sides of the rollerand positively obstructs any movement of the lever member 20, andconsequently the rockshaft '11 and stop arm 12, except that permitted bythe drop section 23 of said cam groove or raceway; furthermore, if fromany cause it happens that the stop-finger 14 descends upon the wire sideof a fastener F, owing to the positive urging of the stop-finger towardthe latter which is exercised by the box or raceway cam member, a strongclamping pressure is thereby exercised by the stoparm and itsstop-finger which is sufiicient to arrest movement of the fastener andhold the same until the needle 7 descends past the same and enters thematerial being stitched.

From the standpoint of structure, the provision of the box or racewaycam reduces the entire stop mechanism to greater simplicity, andobviates the requirement of additional stops and adjustments thereofnecessary to be used when the rock-shaft and stop arm are springactuated in one direction. Furthermore, since strong tensional springsfor moving the rock-shaft in one direction are eliminated, the operationof the machine is much easier and strains are avoided. This is of markedadvantage when utilizing the stop mechanism on high speed power drivensewing machines.

Another advantage of positively and unyieldingly holding the stop-armand its stopfinger down in active position when the needle is raised, isthat the machine operator cannot over-insert fastener material, such asfastener tape, when beginning to sew, since the unyielding loweredstop-finger acts as a gauge to permit only just enough insertion of tapesufiicient to engage the first fastener at its leading end. By reason ofthis a no inconsiderable saving of tape is accomplished. This advantagewill be obvious when it is remembered that in arrangements wherein thestop-arm and finger are spring pressed to active position, it ispossible for the operator to raise the, stop-arm to an out of serviceposition when making starting insertions of material, and consequentlyover insertion of such material is of so frequent occurrence that wasteof tape results.

The low part of the cam groove or raceway may be variously dimensionedaccording to the length of period of stop-arm release desired to beobtained, and, in fact, various modifications of the specific shape ofsaid cam groove or raceway may be made according to the type of sewingmechanism with which the stop mechanism is desired to cooperate.

As other changes could be made in the above construction and apparentlywidely different embodiments of this invention could be made withoutdeparting from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingshall be interpreted as illustrative and not in a limiting sense.

Having thus described this invention, I claim 1. In a sewing machineprovided with a sewing mechanism including a reciprocating needle, adrive shaft to actuate said sewing mechanism, a rock-shaft, a stop-armcarried by said rock-shaft with its forward end disposed at one side ofthe machine needle and adapted to be moved into and out of the path ofmovement of fasteners on material fed to the sewing mechanism, a box camfixed on said drive shaft, said cam having in a face thereof a camraceway the major portion of which is concentric to the drive shaft anda minor portion of which forms an inwardly offset drop sectionfunctioning to momentarily release said stop-arm and its finger fromnormal fastener arresting position, and a lever arm fixed to saidrock-shaft and having means projected into said cam raceway so as toride therein, whereby stop-arm positioning oscillations of saidrock-shaft are positively controlled in both directions.

2. In a sewing machine provided with a sewing mechanism including areciprocating needle, a drive shaft to actuate said sewing mechanism, arock-shaft, a stop-arm carried by said rock-shaft with its forward enddisposed at one side of said needle, a stop finger dependent from theforward end of said stop arm and movable into the path of movement ofeye fasteners on material fed to said sewing mechanism, said stop fingerhaving its front face in a plane immediately in advance of the path ofneedle descent, said stop finger also having a cross-sectional area lessthan that of the interior of said eye fasteners so as to be capable ofentering the latter in stopping relation to the trailing wire sidesthere of at proper times, a box cam fixed on said drive shaft, said camhaving in a face thereof a cam raceway the major portion of which isconcentric to the drive shaft and a minor portion of which forms aninwardly offset drop section functioning to momentarily release saidstop-arm and its finger from normal fastener arresting position, and alever arm fixed to said rock-shaft and having means projected into saidcam raceway so as to ride therein, whereby stop-arm positioningoscillations of said rock-shaft are timed relative to

